The earliest ones to come to Oz were "surplus" from, allegedly, Sudan. These were the early LIGHT model with the one-piece hand-guard and the externally-fluted barrel. Cool as Hell, and not bad to shoot standard NATO ball. Every one that I saw had been "butchered" at some time by having the gas-tube cut by the simple expedient of dropping a saw through the one-piece, round-ish hand- guard and through the gas tube. Whoever "restored" them replaced the tube but did a very dodgy job of repairing the hand-guards. The fluted barrels were kinda cute. ALL had the "rock 'n' roll" bits , including the "hook" on the hammer, removed.
Then the "Portuguese" models showed up. Heavier, but with all the fruit. Very pleasant to shoot and quite accurate with Oz ball ammo. A few have survived the "gun purges" here in Oz.
Machinery WAY ahead of its time. The fiasco of the SR-25 simply shows up the fact that Eugene Stoner got it pretty much right nearly forty years earlier.